Information on indices maths can be found on the Laerd Mathematics website. There are many examples of formulas which one may find informative and useful.
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Indices (not indicies) have two meanings: one is powers. In the expression x3, the 3 is an index. The second meaning is a counter. If you have five observations and they are labelled X1, X2, ... , X5 then the numbers in Xn is an index.
There are a few websites that offers this educational service online. One can go to Cricketweb, Maths Zone, Mad4Maths, and even BBC websites to find them.
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I am not sure what the question means. However, a square is written as x2 and so it has one index whose value is 2.
One gross = 144